совместимость Firefox 9 с Windows XP - будет ли работать стабильно, и какие аппаратные характеристики нужны для девятой версии?

Firefox 9 works fine on an XP SP3, 3G RAM system that I have.

• See --> https://www.mozilla.org/en-US/firefox/9.0.1/system-requirements/

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А требования к "железу" - память, частота процессора и проч. какие для этой версии?

If Firefox 5 works then Firefox 9 should work as well.

If you see any error messages in the Graphics section of the Help > Troubleshooting Information page then make sure to have the latest drivers for your graphics display card.

• https://support.mozilla.com/kb/Using+the+Troubleshooting+Information+page

See also;

• https://support.mozilla.com/kb/common-questions-after-updating-firefox